|Role||Ruler of the Dinosaur Kingdom, Life Guard at the Dinosaur Swimming Pool, Magisword Guardian, Villain|
|Hair color||Light blue|
|Friends||Goomer, Frankylo, Warriors for Hire (at times), Ralphio (one-sided relationship, Ralphio's side presumably)|
|Enemies||Warriors for Hire (at times)|
|First Appearance||The Land Before Slime|
|Latest Appearance||The Mystery of Loch Mess|
|Voiced by||Eric Bauza|
King Rexxtopher is an occasional antagonist in Mighty Magiswords. Ruler of the Dinosaur Kingdom, he often cross paths with the Warriors for Hire and often banishes them for smuggling and eating dinosaurs.
Most of the time, King Rexxtopher has an annoyed expression, possibly because of the antics of Warriors for Hire for trying to eat dinosaurs and violating the rules of the kingdom. As such, he often banishes the two from the Dinosaur Kingdom. He is also annoyed by the antics of hisHe is also aware of Vambre's cute and innocent techniques and does not fall for them. He is also straight-forward as he openly stated that he will keep stomping houses in Rhyboflavin until the Warriors show up. Despite this, he can be compassionate and allow Goomer and Frankylo to be buddies despite the situation. He is also a fair person as he paid the Warriors for watching over Jurassi in the short Walkies even though when he said his farewell, he mentioned them to never return to the Dinosaur Kingdom, hinting they were banished again. At desperate times, he is also willing to get the Warriors' help such as saving him from Glori and rewards them by not banishing them but gives them a hand-woven craft by himself.
One day Prohyas and Vambre went to an unknown area to find the claw magisword. They found a Dinosaur king named King Rexxtopher and he was sleeping with the claw magisword in his arms. Prohyas and Vambre used some of their magiswords to wake him up and it went successful and he started to attack them. Then Prohyas and Vambre ate some dinosaur meat until he attacked them again, demanding that they stop eating dinosaurs even though the two refused because they like it. Prohyas used the pencil magisword to draw and mustache on his face and he got half eaten by King Rexxtopher. Vambre chose wisely by using the snowball magisword to freeze him and after that one of them kept the claw magisword.
His major appearance is in the episode "The Land Before Slime" where he warns Prohyas and Vambre to stop taking dinosaurs from his kingdom. After stealing Frankylo the Ankleosaurus, he starts stomping houses in Rhyboflavin until they show up because they stole his sisters' best friends' baby. When they prepared to have a big fight, Goomer and Frankylo came to save the day to say that he wanted a cool dinosaur to befriend because he has no limbs. King Rexxtopher explains that Frankylo makes friends fast due to his friendly personality. He feels benevolent and lets Goomer come back to Dinosaur Kingdom but banishes Prohyas and Vambre again.
He later appeared in the episode "Pool Fools" as a lifeguard of the Dinosuar Kingdom Public Fool, making sure the dinosuars are in check. He refuses to let the Warriors swim in there and kicked them out twice. Later, he was fooled by their mummy disguise and after capturing them, threatens to hurt them. The Warriors ask why they weren't allowed in, in which he replies that it's hard enough to deal with the dinosuars in the pool, the Warriors would make his stress even worse by being there and all he wants is peace and quiet. So, he disguises Rexxtopher as a woman to enter the Rhyboflavin Public Pool soaking in a hot tub with Ralphio who he failed to flirt.
In his second appearance "Walkies", he senses the sound of Jurassi's laughter while performing a hobby to calm his nerves. He knew immediatley that it the Warriors were behind it. As he chased them, and took Jurassi back, as it seemed he was gonna kill them, he gives them a huge sack of gems and thanks them for watching Jurassi for him citing that he's a handful. He then leaves and tells them to never come back to the Dinosaur Kingdom again.
In the series premiere, The Mystery of Loch Mess, he complains of Prohyas' loud shouting from his Microphone Magisword because he was trying to concentrate on his paper.
In his major episode, Working for Scales, he was enjoying tea until a dino informed him that the Warriors have come to steal a spike from an Orange Spangled Specolosaurus. He summons his Dino Patrol Squad to stop the Warriors in every way possible. Towards the end of the episode, despite their defeat, they enjoy some tea for scaring the Warriors away from the Kingdom.
In the episode, Biggest Fan, King Rexxtopher summons the Warriors to save him from Glori, who is inside his body. As Glori forces Rexxtopher to swallow her down, the Warriors try flushing and sneezing her out of him. After Glori was removed, Rexxtopher rewards them by not banishing them, giving them a hand stitched portrait of himself and kicks them home.
- Super Strength: Being a really tall dinosaur, he was able to kick the Warriors out of the kingdom by smacking them with his tail and cannonballing on the pool to send them flying.
- Magisword user: Rextopher is in possession of the Claw Magisword a weapon used to make up for his small arms. It is seemingly a prehensile tool that moves how the person wielding it would try and use their regular hand
- He often has a habit of emphasizing the letters and words, mostly the letter "S" such as saying "Benevolentsesesese" instead of "Benevolent" or "Escophalafoagugugugus" instead of esophagus.
- He's human intolerant and swells up if he swallows a human. Despite that, he frequently chews on the Warriors when direct in battle in the CN Micro Shorts.